The word "breve" here means musical note, its duration is equal to two whole notes (like how the duration of a whole is equal to two half notes and so on).
It has another singular form — "brevis".
What is the plural form of "breve" or "brevis"? How do I correctly say "two 'breve's"?
Variants "two breves" and "two brevises" seem incorrect for me.
P.S.: I can't use "double", since in my case this word already stands for another thing.